I'd like to see a good explanation of the celestial gears model. It's hard to find the explanation in much more detail than a gif of gears, demonstrating how they can rotate in opposite directions, and a general description of where the teeth and where the centre of the main one is.
That explains the principle but it doesn't help with, for example, what stars are where: how much of the night sky is in one gear, and any relationship to the tracks the Sun takes.
It'd also be good to have a page on aether/dark energy with clear divides, to sort out the various models used. There's the fabric-of-space model (under multiple formulations), some that model it more as an actual fluid, the 'interaction of charged and non-charged particles' or something like that...
It might be worth trying to come up with a diagram, just to sort out related areas and competing models. Like, link together celestial gears and celestial gravitation.
Planning for a while is pretty much required. With the multitude of FE models, and the overlap, it might be worth trying to figure out what comes under what section. Then title accordingly, and you'd have a wiki that's instantly much more readable. Like, the page on UA could link to denpressure and the density-downwards law as alternate explanations for the same effect.
Honestly, a framework of empty pages is probably more useful than an uncoordinated mess of filled-up ones, because information's only useful if it's accessible in the right context.
Also, have you considered making a section of the forum for drafting wiki pages? it saves the need of giving editor-powers out, and anyone will be able to help (even REers) by writing up a page on some aspect of a model that they feel they understand. Then someone can vet it, and post it.